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Parent company financial statements - Income Statements (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income |  |  |  |  |  |  |  |  |  |  |
Dividend income from subsidiaries |  |  |  |  |  |  |  |  | $ 2,705 | $ 4,051 | $ 2,126
(Loss) gain from other assets |  |  |  |  |  |  |  |  | (90) | (104) | 328
Net interest income | $ 85,244 | $ 68,828 | $ 55,337 | $ 56,249 | $ 57,692 | $ 58,305 | $ 57,023 | $ 53,016 | 265,658 | 226,036 | 204,068
Interest expense |  |  |  |  |  |  |  |  |  |  |
Interest expense | 12,992 | 12,299 | 10,270 | 13,425 | 13,951 | 14,937 | 14,696 | 12,917 | 48,986 | 56,501 | 35,503
Other noninterest expense |  |  |  |  |  |  |  |  | 213,945 | 146,653 | 121,200
Net income applicable to FB Financial Corporation | $ 45,602 | $ (5,599) | $ 22,873 | $ 745 | $ 21,572 | $ 23,966 | $ 18,688 | $ 19,588 | 63,621 | 83,814 | 80,236
Parent Company |  |  |  |  |  |  |  |  |  |  |
Income |  |  |  |  |  |  |  |  |  |  |
Dividend income from subsidiaries |  |  |  |  |  |  |  |  | 49,706 | 0 | 0
Gain on investments |  |  |  |  |  |  |  |  | 217 | 0 | 0
(Loss) gain from other assets |  |  |  |  |  |  |  |  | 0 | (16) | 297
Other income |  |  |  |  |  |  |  |  | 1,732 | 211 | 0
Net interest income |  |  |  |  |  |  |  |  | 51,655 | 195 | 297
Interest expense |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | 3,122 | 1,638 | 1,651
Salaries, legal and professional fees |  |  |  |  |  |  |  |  | 1,458 | 1,056 | 1,481
Other noninterest expense |  |  |  |  |  |  |  |  | 283 | 120 | 960
Total expenses |  |  |  |  |  |  |  |  | 4,863 | 2,814 | 4,092
Income (loss) before income tax benefit and equity in undistributed earnings of subsidiaries |  |  |  |  |  |  |  |  | 46,792 | (2,619) | (3,795)
Federal and state income tax benefit |  |  |  |  |  |  |  |  | (1,155) | (683) | (746)
Income (loss) before equity in undistributed earnings of subsidiaries |  |  |  |  |  |  |  |  | 47,947 | (1,936) | (3,049)
Equity in undistributed earnings from subsidiaries |  |  |  |  |  |  |  |  | 15,674 | 85,750 | 83,285
Net income applicable to FB Financial Corporation |  |  |  |  |  |  |  |  | $ 63,621 | $ 83,814 | $ 80,236

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